According to the Oxford English Dictionary grey literature is "documentary material which is not commercially published or publicly available, such as technical reports or internal business documents." This includes technical and government reports, statistics, and social media outputs.
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Non-commercially published materials including research reports, working papers, conference proceedings, theses, preprints, white papers, blogs, podcasts, social media posts, guidelines, policy documents, and reports from government, academia, business, and industry.
Grey literature is not peer-reviewed, so quality varies. You need to use critical thinking skills to evaluate what you find.
Lens.org is freely available and covers patents, scholarly works, and biological sequence analysis. You can include or exclude countries and regions, and see how the documents have been cited in other people’s research.
